My favorite method is centrifugal; hold the bottle by the non-pouring end with the cap firmly tightened and give it a good fast swing with your arm (be careful

My favorite method is centrifugal; hold the bottle by the non-pouring end with the cap firmly tightened and give it a good fast swing with your arm (be careful not to break it on anything). This will move all the ketchup to the neck of the bottle (might require a few reps). Then, unscrew, and holding the bottle where you wish to dispense product, using your palm just above where your palm meets your wrist, tap firmly on the neck of the bottle just below (as the bottle is now facing downward, just slightly towards the open end) the curve onto the neck while shaking the bottle up and down, with an exaggerated downward "stabbing" motion.